Karl Ruben vs Jan Willem te Kolste
1st olm final London ENG round 5 1927.07.21
King’s Indian Defense: Fianchetto Variation, Delayed Fianchetto 0-1

Karl Ruben vs George Alan Thomas
Prague Olympiad Prague CSR round 3 1931.07.13
King’s Indian Defense: Four Pawns Attack 0-1

Karl Ruben vs Aron Nimzowitsch
Copenhagen Masters Politiken Copenhagen DEN 1927.06.??
Nimzo-Indian Defense 1/2-1/2